Pulverized fuel burner



May 8, 1934. J. E. KENNEDY El AL 1,957,965

PULVERIZED FUEL BURNER Filed July 16, 1929 2 Sheets-Sheet l TIL 5.1. Jus E1211 RKemmEiy J5 nnLuluuulnis INVENTOR A TTORNEY May 8, 1934. J. E. KENNEDY ET AL PULVERIZED FUEL BURNER w 5 2 m mm H m n N M h E 0 S K U 7. Hr N T. a E n A m .h L S F 2 E n 5 a D E J J 9 2 9 1 mm 0 9 M V. 7 6 W m f J M m i E H rllll F l l I 1 I I l I ll 0 m I l/ .||6 u. 7 l l 'l'll' l' ml P R Patented May 8, 1934 SATES rarer OFFICE PULVERIZED FUEL BURNER assignments, to Nellie Kennedy, New

York,

Application July 16, 1929, Serial No. 378,676

5 Claims.

Our invention relates to pulverized fuel burners and refers more particularly to vertical slotted burners adapted to be utilized between the tubes of a water wall, utilizing one of the tubes provided with a deflector.

One object of our invention is to provide a burner adapted to be utilized between tubes of a water wall in a furnace.

Another object of our invention is to provide a pulverized fuel burner adapted to direct pulverized fuel and primary air outwardly between adjacent'tubes of a water wall and to direct two or more horizontal streams of secondary air into the streams of pulverized fuel and primary air.

A further object of our invention is to provide a pulverized fuel burner that is provided with an adjustable tip.

A still further object of our invention is to provide a pulverized fuel burner wherein the direction of the secondary air is adjustable and regulatable in quantities supplied through the various openings adjacent to said burner.

One of the most valuable objects of our invention is to provide a pulverized fuelburner having a means for regulating and uniformly distributing the pulverized fuel and primary air throughout the burner and discharging the same into streams of secondary air.

Another of the most valuable objects of our invention is to provide a means for regulating a uniform flow of material through the slotted tip of the burner, preferably with deflecting means attached to the walls of the burner or the burner feed pipe.

It is well known in the art that slotted burners have been used, but none of them contemplate the specific purpose of this device, have the same organization of particular parts, or incorporate the novel combination of elements utilized in this burner.

With these and other objects in view, our invention consists of the novel construction, arrangement, and formation of parts, the particular utility and specific application of the combination and the novel method of operating the same, hereinafter referred to and described, claimed, and substantially as illustrated in the accompanying. drawings, wherein similar numerals refer to like parts throughout the several views.

Figure 1 is a vertical section of the device taken on lines l1 of Figure 2.

Figure 2 is a front elevation of the burner box taken on lines 22 of Figure 1. I

Figure 3 is a section taken on lines 33 of Figure 4., illustrating an alternative arrangement of the device.

Figure 4 is a partial section taken on lines 4-4 of Figure 3.

It is well known that in providing pulverized fuel, ordinary furnaces, having what is commonly known as a water wall, or water tubes, that it has been necessary to make two additional headers to provide room for the burners and for the supply of secondary air entering the furnace adjacent to the burner orit was necessary to bend the tubes to make room for the insertion of the burner tip, and for the entrance of secondary air near the burner tip;

Our invention enables the application-of this device to the standard setting of straight tubes forming a water wall, and the utilization of these tubes, in front of which is positioned the burner. The axis of this burner preferably is in alignment with the axis of the water wall tube and by attachinga deflector wedge on the tube the primary air and coal is deflected outwardly in two directions and secondary air is deflected inwardly into the streams of primary air and coal between as many tubes as may be found to give the best result. 1

At eachof these secondary air openings, there is a deflector or hinged door mountedso that the entrance of secondary air to the furnace can be regulated, or shut off entirely, making the burner applicable to a high or low rating.

Recent experience shows that the boilers that are so arranged have been operated as high as 600% of the boiler manufacturer's rating without damage to the water wall or refractories.

When this burner is applied to an old boiler setting, it will make it possible to produce from 2 to 6 times the steam now produced ordinarily, which will make it unnecessary, in many cases, to install new boilers, or in the case of new installations, it is possible to install one boiler that will have the'same steaming capacity as from 2 to 6 boilers. p

Heretofore, the uniform distribution of primary air and pulverized coal through the burner tip has been diflicult, if not impossible, not only in the horizontal but in the vertical burners and especially in the vertical burners, such as shown in the accompanying drawings, for the reason that the coarser particles of coal would concentrate at the bottom of the burner, and therefore give an uneven distribution of the coarse and fine particles of the coal, but what was still worse, a very much greater percentage of the heat unit value of the coal would be concentrated at the bottom of the burner.

This condition would provide an insufficient amount of secondary air for complete combustion at one side of the furnace, or at one end of the vertical burner, and an excess of air at the other end, which would result in poor operation.

Our invention corrects this trouble by placing partitions in the burner, and with the aid of adjustable deflectors outside of the partitions, provides a means for the accurate distribution of both the coarse and the fine coal to the various partitions in the burner, and through the entire width and depth of the burner, thus applying an even flat or ribbon shaped stream of primary air and coal of a uniform mixture and calorific value, and uniform ribbon shaped streams of secondary air of the proper quantity to complete combustion.

The burner is comprised of a vertically arranged burner tip 1, providing a long narrow outlet 2, tapered back to a rectangular shape at 3, wherein there are two adjustable deflectors 4 and 5, the deflector 4 provided with a handle 6 pivoted at 7 and the deflector 5 provided with a handle 8, pivoted at 9.

This rectangular part of the burner is extended and formed into a pipe at 10 with a flange 11 attachable to the pipe 12, with a flange 13, by the bolts 14.

This burner tip 1, is divided into three parts or passages 62, 63, and 64, by means of the partitions and 66.

The burner proper is preferably inclined as shown in Figure 1, but it is obvious that it could be utilized in any desirable position.

This burner is enclosed in an air box 15 provided with an inlet 16, flanged at 1'7, adapted to be attached to any suitable feeding means. On the inside of this air box on each side and over the burner, are a suitable number of air deflectors.

The deflectors 18 and 19 extend the full width of the box, and are provided with pivots 20 and 21, respectively.

The deflectors 22 and 23 on each side of the burner are both supported by the pivot 24.

The deflectors 25 and 26, on each side of the burner box are provided with pivots 2'7 and 28 respectively.

The deflectors 29 and 30, on each side of the burner box are provided with pivots 31 and 32, respectively.

The deflectors 33 and 34, on each side of the burner box are provided with pivots 35 and 36 respectively.

The deflectors 3'7 and 38, on each side of the burner box are provided with pivots 39 and 40, respectively.

One end of the deflector 18 is provided with a slotted extension 41 adapted to engage with a pin 42 in a connecting link 43, and the opposite end of this deflector is provided with a slotted extension 44, adapted to engage with a pin 45 in the connecting link 46.

The deflector 19 is pro-vided with a slotted portion 4'7 adapted to engage with a pin 48 in the connecting link 43.

The deflector 22 is provided with a slotted portion 49, adapted to engage with a pin 50 which is fixed in the link 43.

The deflector 25 is provided with a slotted portion 51 adapted to engage with a pin 52 fixed in the link 43.

The deflector 29 is provided with a slotted portion 53 adapted to engage with the pin 54 in the link 43.

The deflector 33 is provided with a slotted portion 55 adapted to engage with the pin 56 which is fixed in the link 43.

The deflector 37 is provided with a slotted portion 56 adapted to engage with a pin 5'7 fixed in the link 43.

The deflector 23 is provided with a slotted portion 58 adapted to engage with the pin 59 fixed in the link 46. The deflector 26 is provided with a slotted portion 60, adapted to engage with a pin 61, fixed in the link 46.

The deflector 30 is provided with a slotted portion 62 adapted to engage with the pin 63 fixed in the link 46.

The deflector 34 is provided with a slotted portion 64 adapted to engage with the pin 65 fixed in the link 46.

The deflector 38 is provided with a slotted portion 66 adapted to engage with a pin 6'7 fixed in the link 46.

It is obvious that the links 46 and 43 will operably connect all these dampers together, so that when the lever 68 that is pinned to the shaft 21 is moved, this shaft also being fixed to the deflector 19, all of these dampers will be moved in accordance with the movement of the lever 68.

There is also provided a U shaped extension 69 of this burner tip provided with slots '70 and '71 engageable with the pins '72 and '73, respectively, that are fixed intothe burner tip 2 to provide a means for moving the extension back and forth for the purpose of shortening or lengthening the extension.

The open ends of this extension are connected to a lever '74, by the pivots '75, which lever is fixed to a shaft '76, having a handle '77, fixed thereto, outside of the burner box as shown in Figures 1 and 2, so that when this handle is moved the extension will slide angularly to or from the burner tip.

The burner tip 2 is directly back of the tube '78, which is provided with a wedge-shaped deflector '79 extending the full length of the burner tip, so that primary air and pulverent fuel from the burner tip will be deflected outwardly each side of this deflector as clearly shown in Figure 3, and the secondary air will be entrained into these two streams of primary air and pulverent material on each side of the deflector.

It is obvious that there will be a vortex action established at 80, as shown in Figure 3, due to the reaction of the primary air and pulverent material and secondary air which will tend to more thoroughly mix the same together.

In Figures 3 and 4 there is shown an alternative arrangement of the device wherein the burner 1, with its parts in exactly the same position as shown in Figures 1 and 2, the only difference being in the application of the secondary air thereto and the construction of the box.

The extension of the burner tip is exactly the same except that the lever '74 is not used, the extension pivotally carrying two levers 80a and 805 which are fixed to the shaft 81 which is suitably supported by the support 82, and on one end of this shaft is a flxed arm 83 suitably connected to a rod or handle 84, projecting outside of the casing 85.

The sides of this casing 85 are provided with two secondary air inlets like 86 and 87.

This casing preferably encloses nine pipes, 88, 89, 90, 91, 92, 93, 94, 95 and 96, the pipe 88 carrying a Wedge shaped part 9'7, and the other pipes 89 to 96, inclusive, provided with similar parts indicated by like numerals and each pipe provided with triangular parts like 98 formed as shown in Figure 3, so that all the secondary air will be deflected outwardly toward the centerline of the burner.

To control the secondary air passing between the pipes 88 and 89, the damper 99, pivoted at 100, having a handle 101 is provided.

To control the secondary air passing between the pipes 89 and 90, the damper 102, pivoted at 103, and having a handle 104, is provided.

To control the secondary air passing between the pipes 90 and 91, the damper 105, pivoted at 106, and having a handle 107, is provided.

To control the secondary air passing between the pipes 91 and. 92, the damper 108, pivoted at 109, and having a handle 110, is provided.

To control the secondary air passing between the pipes 92 and 93, the damper 111, pivoted at 112, and having a handle 113, is provided.

To control the secondary air passing between the pipes 94 and 95, the damper 117, pivoted at 118, and having a handle 119, is provided.

To control the secondary air passing between the pipes 95 and 96, the damper 120, pivoted at 121, and having a handle 122, is provided.

Having thus illustrated and described the preferred embodiment of our invention, we do not wish to limit ourselves to the exact construction or arrangement of parts shown, since it is evident that modifications may be made therein without departing from the spirit of the invention or the scope of the claims.

We claim:-

1. A pulverized fuel burner comprising spaced water tubes having deflectors thereon, a wind box arranged to discharge air between the deflectors, and a flaring fuel nozzle provided with an elongated discharge opening terminating within the wind box adjacent one of said deflectors, said deflectors coacting with the wind box and fuel nozzle to form distributing nozzles for the mixture of fuel and air and the secondary air delivered between the deflectors, said fuel nozzle having partitions forming channels therein, the inlet end of the fuel nozzle being provided with adjustable deflectors to control the quantity of fuel and air passing through said channels.

2. A pulverized fuel burner comprising spaced water tubes having deflectors thereon, a wind box arranged to discharge air between the deflectors, and a flaring fuelnozzle provided with an elongated discharge opening terminating within the wind box adjacent one of said deflectors, said deflectors coacting with the wind box and fuel nozzle to form distributing nozzles for the mixture of fuel and air and the secondary air delivered between the deflectors, said fuel nozzle having partitions forming channels therein, and means at the inlet end of the fuel nozzle for controlling the quantity of fuel and air passing through said channels.

3. A pulverized fuel burner comprising spaced apart water tubes having deflectors thereon, a wind box arranged to discharge air between the deflectors, and a flaring fuel nozzle provided with an elongated discharge opening terminating within the wind box adjacent one of said deflectors, a slidable extension for said nozzle end provided with means, outside of said wind box, for controlling the position of the same, said deflectors coacting with the wind box and fuel nozzle to form distributing nozzles for the mixture of fuel and air and the secondary air delivered between the deflectors, said fuel nozzle having partitions forming channels therein, and means at the irflet end of the fuel nozzle for controlling the quantity of fuel and air passing through said channels.

4. In combination with a furnace having spaced water tubes forming a wall thereof, a burner comprising deflectors mounted on said tubes, a wind box arranged to discharge air between the deflectors, and a flaring fuel nozzle provided with an elongated discharge opening terminating within the wind box adjacent one of said deflectors, said opening provided with an adjustable exten sion, said deflectors coacting with the wind box and fuel nozzle to form distributing nozzles for the mixture of fuel and air and the secondary air delivered between the deflectors, said fuel nozzle having partitions forming channels therein, and means at the inlet end of the fuel nozzle for controlling the quantity of fuel and air passing through said channels.

5. In combination with a furnace having spaced apart water tubes forming a water wall thereof, a burner comprising deflectors mounted on some of said tubes, a wind box arranged to discharge air between the deflectors, means outside of said wind box for positioning the deflectors, and a flaring fuel nozzle provided with an elongated discharge opening terminating within the wind box adjacent one of said deflectors. and provided with an adjustable extension, said deflectors coacting with the wind box and fuel nozzle to form distributing nozzles for the mixture of fuel and air and the secondary air delivered between the deflectors, said fuel nozzles having partitions forming channels therein, and means at the inlet end of the fuel nozzle for controlling the quantity of fuel and air passing through said channels.

JOSEPH E. KENNEDY. JEAN LABOULAIS. 

